Abstract
In order to develop a silane coupling agent that has excellent durability, the influence of the functional group, such as chloro and ethoxy groups of the agent, on the improvement of the silica surface was investigated.The contact angle of water against the silica surface treated with several kinds of γ-methacryloxy-propyl-chlorosilanes did not depend on the number of the chloro groups, and thus the effect of treatment was considered to be the same.However, the tensile strength of the resin against this silica surface differed among them.In addition, adhesional failure occurred in γ-MPMCS-treated silica, while cohesional fracture of resin occurred in γ-MPTCS-treated silica.The adsorption mechanism differed among the silane coupling agent that have several kinds of ethoxy groups(γ-methacryloxy-propyl-ethoxysilane);the amount of the mobile component in the ESR spectrum of the spin-labeled agent mixed with γ-MPTES increased, compared with the spectrum of the agent mixed with γ-MPMES, when these agent were absorbed on the colloidal silica.Thus, there was a good correlation between the adsorption mechanism and the bonding strength of silica/matrix resin treated with silane coupling agent.
